/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.intercept.cglib;

import java.io.Serializable;
import java.util.Set;

import net.sf.cglib.transform.impl.InterceptFieldCallback;

import org.hibernate.engine.SessionImplementor;
import org.hibernate.intercept.AbstractFieldInterceptor;
import org.hibernate.proxy.HibernateProxy;
import org.hibernate.proxy.LazyInitializer;

/**
 * A field-level interceptor that initializes lazily fetched properties.
 * This interceptor can be attached to classes instrumented by CGLIB.
 * Note that this implementation assumes that the instance variable
 * name is the same as the name of the persistent property that must
 * be loaded.
 *
 * @author Gavin King
 */
public final class FieldInterceptorImpl extends AbstractFieldInterceptor implements InterceptFieldCallback, Serializable {

	/**
	 * Package-protected constructor
	 *
	 * @param session The Hibernate session
	 * @param uninitializedFields Names of the fields we need to initialize on load
	 * @param entityName The entity name to which we are being bound
	 */
	FieldInterceptorImpl(SessionImplementor session, Set uninitializedFields, String entityName) {
		super( session, uninitializedFields, entityName );
	}

	public boolean readBoolean(Object target, String name, boolean oldValue) {
		return ( ( Boolean ) intercept( target, name, oldValue  ? Boolean.TRUE : Boolean.FALSE ) )
				.booleanValue();
	}

	public byte readByte(Object target, String name, byte oldValue) {
		return ( ( Byte ) intercept( target, name, new Byte( oldValue ) ) ).byteValue();
	}

	public char readChar(Object target, String name, char oldValue) {
		return ( ( Character ) intercept( target, name, new Character( oldValue ) ) )
				.charValue();
	}

	public double readDouble(Object target, String name, double oldValue) {
		return ( ( Double ) intercept( target, name, new Double( oldValue ) ) )
				.doubleValue();
	}

	public float readFloat(Object target, String name, float oldValue) {
		return ( ( Float ) intercept( target, name, new Float( oldValue ) ) )
				.floatValue();
	}

	public int readInt(Object target, String name, int oldValue) {
		return ( ( Integer ) intercept( target, name, new Integer( oldValue ) ) )
				.intValue();
	}

	public long readLong(Object target, String name, long oldValue) {
		return ( ( Long ) intercept( target, name, new Long( oldValue ) ) ).longValue();
	}

	public short readShort(Object target, String name, short oldValue) {
		return ( ( Short ) intercept( target, name, new Short( oldValue ) ) )
				.shortValue();
	}

	public Object readObject(Object target, String name, Object oldValue) {
		Object value = intercept( target, name, oldValue );
		if (value instanceof HibernateProxy) {
			LazyInitializer li = ( (HibernateProxy) value ).getHibernateLazyInitializer();
			if ( li.isUnwrap() ) {
				value = li.getImplementation();
			}
		}
		return value;
	}

	public boolean writeBoolean(Object target, String name, boolean oldValue, boolean newValue) {
		dirty();
		intercept( target, name, oldValue ? Boolean.TRUE : Boolean.FALSE );
		return newValue;
	}

	public byte writeByte(Object target, String name, byte oldValue, byte newValue) {
		dirty();
		intercept( target, name, new Byte( oldValue ) );
		return newValue;
	}

	public char writeChar(Object target, String name, char oldValue, char newValue) {
		dirty();
		intercept( target, name, new Character( oldValue ) );
		return newValue;
	}

	public double writeDouble(Object target, String name, double oldValue, double newValue) {
		dirty();
		intercept( target, name, new Double( oldValue ) );
		return newValue;
	}

	public float writeFloat(Object target, String name, float oldValue, float newValue) {
		dirty();
		intercept( target, name, new Float( oldValue ) );
		return newValue;
	}

	public int writeInt(Object target, String name, int oldValue, int newValue) {
		dirty();
		intercept( target, name, new Integer( oldValue ) );
		return newValue;
	}

	public long writeLong(Object target, String name, long oldValue, long newValue) {
		dirty();
		intercept( target, name, new Long( oldValue ) );
		return newValue;
	}

	public short writeShort(Object target, String name, short oldValue, short newValue) {
		dirty();
		intercept( target, name, new Short( oldValue ) );
		return newValue;
	}

	public Object writeObject(Object target, String name, Object oldValue, Object newValue) {
		dirty();
		intercept( target, name, oldValue );
		return newValue;
	}

	public String toString() {
		return "FieldInterceptorImpl(" +
			"entityName=" + getEntityName() +
			",dirty=" + isDirty() +
			",uninitializedFields=" + getUninitializedFields() +
			')';
	}

}